8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4430 Comm: syz.0.134 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813ac988>] lr : [<813ac978>] psr: 60000013 sp : e0515d30 ip : e0515d30 fp : e0515d54 r10: 82b16f40 r9 : 00000003 r8 : 84196480 r7 : e0515d90 r6 : 84196480 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e15644 r1 : 00000001 r0 : 813ac5f8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 849e25c0 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 84196480 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0514000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84196480 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xe0514000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xe0514000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.134 (pid: 4430, stack limit = 0xe0514000) Stack: (0xe0515d30 to 0xe0516000) 5d20: 823ff12c 84196480 829cf9ac 829cf9ac 5d40: 81e15b04 841964c4 e0515d8c e0515d58 813a8a20 813ac820 20000200 00000000 5d60: e0515d7c 20000200 84196480 b5403587 20000200 85000000 40946400 00000003 5d80: e0515e4c e0515d90 813a456c 813a8924 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00008001 00000008 00000001 00000007 00000003 00000ccb 00000008 5dc0: 000000ab 0000000d 00000100 ffffffff 0000befa 00000005 00000001 00000006 5de0: ffffffff 00000001 0001a449 00000003 40000003 00000089 00000002 00000009 5e00: 20001e58 00000005 00000008 0000003c 0000000a 0000000c 00000004 0000000d 5e20: 00000000 75d47e42 00000000 85b96f00 84196480 20000200 20000200 85000000 5e40: e0515f14 e0515e50 813a5538 813a4478 00000000 00000000 00000000 75d47e42 5e60: 00000000 00000000 8247154c 0000005f 83bb9e58 841964b0 8409387c 85000000 5e80: e0515ee4 e0515e90 80797ecc 8078e230 00000064 00000001 00000000 e0515eac 5ea0: 849df850 8343a550 00006400 0000000b e0515ea0 00000000 00000000 75d47e42 5ec0: 85b96f00 40946400 20000200 20000200 85b96f00 00000003 e0515ef4 e0515ee8 5ee0: 80797fec 75d47e42 e0515f14 40946400 00000000 85b96f01 20000200 85b96f00 5f00: 00000003 85000000 e0515fa4 e0515f18 8056d0cc 813a4f68 ecac8b10 85000000 5f20: e0515f3c e0515f30 81a3b378 81a3b248 e0515f54 e0515f40 8025e490 8028ef6c 5f40: e0515fb0 40000000 e0515f84 e0515f58 802229ec 8025e44c 00000000 8281cddc 5f60: e0515fb0 0014c800 ecac8b10 80222940 00000000 75d47e42 e0515fac 00000000 5f80: 00000000 00306308 00000036 8020029c 85000000 00000036 00000000 e0515fa8 5fa0: 80200060 8056cfa8 00000000 00000000 00000003 40946400 20000200 00000000 5fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76fa90bc 5fe0: 76fa8ec0 76fa8eb0 0001948c 001322a0 60000010 00000003 00000000 00000000 Call trace: [<813ac814>] (parport_attach) from [<813a8a20>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841964c4 r5:81e15b04 r4:829cf9ac [<813a8918>] (comedi_device_attach) from [<813a456c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85000000 r7:20000200 r6:b5403587 r5:84196480 r4:20000200 [<813a446c>] (do_devconfig_ioctl) from [<813a5538>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85000000 r7:20000200 r6:20000200 r5:84196480 r4:85b96f00 [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4f5c>] (comedi_unlocked_ioctl) from [<8056d0cc>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85000000 r9:00000003 r8:85b96f00 r7:20000200 r6:85b96f01 r5:00000000 r4:40946400 [<8056cf9c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0515fa8 to 0xe0515ff0) 5fa0: 00000000 00000000 00000003 40946400 20000200 00000000 5fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76fa90bc 5fe0: 76fa8ec0 76fa8eb0 0001948c 001322a0 r10:00000036 r9:85000000 r8:8020029c r7:00000036 r6:00306308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction